Inductor



Patented Feb. 1, 1944 INDUCTOB Carl V. Boyoon, Caldwell, N. J., assigner to Federal Telephone and Radio Corporation, a oorporation of Delaware Application April is, 1942, serial No. 439,221

s claims. (c1. 1v1-242) This invention relates to new and useful improvements in inductors such as are used in radio cmmunication, measuring instruments and the li e.

The object of the invention is to arrange the largest possible number of turns of wire within a given space and yet make the taps leading to various portions of the inductor readily accessible.

With this object in view, the inductor is made with 9. plurality of concentric coils, each with a slightly smaller diameter than the adjacent outer coil. These concentric coils are each divided into spaced sections, each consisting of several turns. The ends of these coil sections are the tap connections of the completed inductor. The width of each coil section is greater than the spacing between the sections. The coil sections of the various concentric coils are staggered so that the coil sections of the inner coils are opposite the space between the coil sections of the immediate outer coil. 'I'he ends of each inner coil section are extended through the spaces between the sections of the outer rows and when properly connected from readily accessible tap connections. Thus by making the spacing between the coll sections less than the coil sections and having a plurality of concentric coils a greater total number of turns is possible in a given length than with a single coil.

The invention will be more fully explained in connection with the drawing in which Fig. 1 is a side elevation of an embodiment of the invention,

with parts broken away;

Fig. 2 is an end view after an end plate has been removed; and

Fig. 3 is a circuit diagram showing the connections between the tap terminals and the coil sections.

Referring first to Fig. 3, the inductor consists of a plurality of concentric coils, in the embodiment illustrated two coils. The concentric coils are divided into a plurality of coil sections in this case a total of 23 with terminals for tap connections numbered 0 to 23 divided into two rows. The wire runs from terminal Il to the rst coil section A and is there formed into a coil section with a plurality of turns, in this case seven turns, then the wire is connected to terminal I. The tap connection from terminal I leads'to the rst section A of the lower row where the wire is again coiled in seven turns. 'I'he end of section A' is connected to terminal 2. The next coil section B is again in the upper row, one end being connected with terminal 2 and the other with terminal 3. Then follows coil section B' in the lower row, section C in the upper row, and so onto section L in the upper row which ls connected with terminal 23. All the terminals can be arranged in a single row or in a plurality of rows,

in the present case two.

The spaces between the sections in one row are narrower than the width of each section and the tap connections of the lower row of sections lead to the terminals through these spaces. Thus many 'more turns of wire can be formed within a space of the same width than would be possible if all the turns were in one row and yet all the terminals will be accessible for tap connections. In the preferred embodiment now to be described. the two parallel rows form concentric circles on the outside of which the terminals are arranged in two parallel rows.

Referring now to Figs. 1 and 2, I and 2 are discs or end plates of insulating material. These support the ends of a plurality of bars, in this case eight, of insulating material on which the inner sections of the inductor are wound, and a plurality of bars, in this case eight, of insulating material on which the outer sections of the inductor are wound. The bars for supporting the inner sections are designated as 3 to IU and the ones supporting the outer sections by the reference numerals II to I8. The manner in which these bars are fastened to the plates I and 2 is indicated in both Figs. 1 and 2. In Fig. l is shown a block of insulating material I8 fastened to plate I by means of a bolt 20 and to which is fastened by means of a bolt 2| one end of bar I3. The other end of the bar is fastened to the end plate 2 by means of a block 22. In Fig. 2 is shown a block 23 to which are fastened the bars 9 and I1 by means of bolts 24 and 2l, respectively, the block being fastened to the end plate 2 by means of bolts 25, 26. Similarly, the outlines of supporting blocks 21, 28 and 29 are indicated adjacent the bars 8-I6, 'I-IE, and G-Il.

The twenty-four terminals 0-22, like 30, II (Fig. 2) are mounted on bars 32, 33 insulated therefrom, the ends of the bars being fastened to plates I and 2 outside of the outer ring oi' sections.

What I claim is:

l. In an inductor, inner and outer coils having substantially parallel axes, each coil being divided into a plurality of spaced sections consisting of a plurality of turns and wherein the outer coil sections have staggered and overlying relation to the inner coil sections.

2. In an inductor, a conductor formed into parallel` inner and outer coils, each coil being divided into spaced sections consisting of plurality of nos, outer coil sections having e. staggered cveriying relation to the inner coil sections and wherein the spacing between the sections lin 'the outer coil is less than the width of the sections in the inner coil, a plurality of terminals outside oi' the outer coil, and tap connections from the outer and inner sections connected to said terminals, the taps of the inner coil sections leading through the spaces between the outer sections.

3. In an Inductor, a. support of insulating material, a conductor formed into concentric inner and outer coils wound on said support, each coil being divided into spaced sections consisting of a plurality of turns, the outer coil sections having a staggered and overlying relation to the inner coil sections and wherein the spacing between the sec tions in the outer coil is less than the Width of the sections in the inner coil, two rows of terminais outside of lthe outer coil, and tap connecm tions from the outer and inner sections to said terminals, the taps of the inner coil sections leadticinesi,

iin-g through the spaces between the outer sections.

el. En an inductor, a plurality of concentric coils, each coil being divided into a plurality of spaced sections consisting ci' a plurality of turns, the sections of one coil having staggered and overlying relation to the sections of another coil, a plurality of terminals, and tap connections leading from said terminals to successive sections, some of said connections leading through the spaces between the sections.

5. In an inductor, a conductor formed into a plurality o1' concentric coils, each coil being divided into spaced sections consisting of a plurality of turns, the sections of one coil having a staggered and overlying relation to the sections of another coil and arranged with the spacing between the sections in each coil being less than the width of its sections, a plurality of terminals outside of the outer coil. and tap connections from the cuter and inner sections connected to said terminals, the taps of the inner coil sections leading through the spaces between the outer section.

CARL V. BOYSON. 

